Money supply is a _____ concept.

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Accepted Answer

1. Definition:

- A "stock" variable is measured at a specific point in time (e.g., the amount of money in circulation on 1st Jan). A "flow" variable is measured over an interval of time (e.g., income earned per month).

2. Money supply:

- Money supply (commonly denoted as $M$, or $M_t$ to indicate time) represents the total quantity of money available in an economy at a particular point in time (for example, $M1$ or $M2$ on a given date).

3. Comparison:

- Because money supply is a snapshot amount at a moment, it is a stock concept, not a flow. (By contrast, variables like GDP or income, often denoted $Y$, are flows measured per period.)

Therefore the correct choice is (1) stock.

FINAL_ANSWER: a

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